Answer: Catla - surface; Rohu - middle; Mrigal - bottom.
- A Rohu - surface; Catla - middle
- B Catla - surface; Rohu - middle; Mrigal - bottom
- C Mrigal - surface; Catla - bottom; Rohu - middle
- D Silver carp - bottom; Grass carp - surface
Correct answer: B. Catla - surface; Rohu - middle; Mrigal - bottom
Explanation: In composite fish culture: Catla feeds at the surface, Rohu in the middle column, and Mrigal at the bottom, avoiding competition.
Different fish species occupy different feeding depths in the same pond without competing for food: Catla feeds near the surface, Rohu in the middle zone, and Mrigal or common carp at the bottom - letting a single pond support far more total fish than one species alone.
Concept context
Learn about animal husbandry, plant breeding, tissue culture, biofortification, and single cell protein.
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